ilsemannite Min.
(ˈɪlsəmənaɪt)
[ad. G. ilsemannit (H. Höfer 1871, in Neues Jahrb. f. Mineral., Geol. u. Palaeont. 567), f. the name of J. C. Ilsemann (1727–1822), German chemist: see -ite1.]
A black or dark blue secondary molybdenum mineral, perhaps a hydrated oxide of molybdenum, Mo3O8.nH2O, which occurs as earthy masses or crusts and as a blue stain and dissolves in water to give a blue solution.
| 1871 Jrnl. Chem. Soc. XXIV. 1173 Ilsemannite... The author gives this name to native molybdic molybdate, MoO2.4MoO3, occurring at Bleiberg in Carinthia, as a bluish-black to black, mostly earthy or cryptocrystalline deposit, between groups of crystals of barium sulphate. 1923 Bull. U.S. Geol. Survey No. 750. 16 Ilsemannite, like wulfenite, is probably formed from some unknown mineral, perhaps a sulphide. 1951 Amer. Mineralogist XXXVI. 611 In general, most mineralogists seem to have applied the name ‘ilsemannite’ to any molybdenum compound or mixture which is water soluble and turns the solution a typical molybdenum-blue color. 1959 Econ. Geol. LIV. 257 Ilsemannite is forming rapidly on the walls of the older mine workings. |